Currently working on exotic sword. I've heard rocketyard is a good location, but haven't had much success.
Edit: Finished! I got bolt caster!
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Just equip a ghost that detects and marks spinmetal.... Itll literally point you to every material in an area if you aim down your sights on a sniper. Did this for 2/3 of my exotic Swords..... Saved so much time. Heed my words Guardian....